Definitely. In the Marvel Comics, Deadpool is considered undead because no matter how much damage he takes, he always comes back due to his unique healing powers. This makes him a very hard character to keep down for good.
Sure thing. Deadpool is an integral part of Marvel Comics. His irreverent and humorous style sets him apart. Marvel has used him in various comic book series and crossovers to great effect.
The Avengers originated in Marvel Comics. Marvel has developed a vast universe of characters and storylines, and the Avengers are a key part of it. Their adventures have been adapted into various forms of media, including movies and TV shows.